I've learnt that in negative sentences, the direct object takes the genitive case. So far, so good. But what if the negated verb is not referring to the object, but to another verb?
Nie chcę pić piwa (piwo?)
Nie musisz zwracać na to uwagi (uwagę?)
Nie zapomnij kupić chleba (chleb?)
Thanks in advance for your answers!